Tibial Plateau Fractures

A tibial plateau fracture is an injury to a weight-bearing articular surface, and it tests your understanding of articular fracture principles, soft-tissue management and staged surgery. Examiners focus on the classification, on when not to operate, on the choice of approach and on avoiding complications.

Who. The distribution is bimodal: young patients with high-energy injuries, where men predominate, and elderly patients with low-energy injuries, where women predominate. The causes are sports injuries, motor vehicle accidents and falls from height. The lateral plateau is the more commonly involved, in 55-70%.

Why it matters. Associated soft-tissue injuries are common, rehabilitation is significant, and the injury has implications for work and function. The long-term risk of post-traumatic osteoarthritis is 10-30% (Rademakers 2007, PMID 17211262; Wasserstein 2014, PMID 24430414).

The two plateaus. The lateral plateau is convex, less congruent with the femoral condyle, and sits higher, 3mm proximal to the medial. It is the more prone to depression fractures, and the lateral meniscus covers 80% of it. The medial plateau is concave and more congruent, with the larger weight-bearing surface and stronger subchondral bone; the medial meniscus covers 50%.

The eminence. The intercondylar eminence is central and contains the ACL and PCL insertions.

Load and stability. In neutral alignment the load is shared 60% medial, 40% lateral, and the menisci transmit 50% of the axial load. Articular cartilage is 2-4mm thick. The medial plateau and the MCL give valgus stability; the lateral plateau, the LCL and the posterolateral corner give varus stability.

Why alignment matters. A fracture disrupts the biomechanical axis, and restoring the mechanical axis is essential for long-term knee function and for preventing arthrosis. The articular surface's tolerance of residual step-off is graded:

• Under 2mm: good long-term outcomes
• 2-5mm: progressive arthrosis
• Over 5mm: accelerated OA

Posterior slope. The plateau slopes 7-10° posteriorly, and the slope must be restored during fixation. Slope is the number that matters after a plateau heals: it governs anterior tibial translation and the ACL. Alignment after a plateau fracture is read on long films, not on the knee series.

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Structures at risk. The popliteal artery lies directly posterior to the tibia, separated from it only by the popliteus muscle, and tethering at the soleal arch makes it vulnerable to injury with posterior displacement. During posterior approaches the neurovascular bundle must be carefully protected.

The common peroneal nerve is at risk in all lateral approaches. It wraps around the fibular neck 1-2cm distal to the joint line; always identify and protect it, and remember that knee flexion relaxes it.

Schatzker (1979, PMID 445923). Six types, and the number carries the energy of the injury. Types I-III are split and depression patterns of the lateral plateau from low-energy injuries; types IV-VI, the medial, bicondylar and dissociated patterns, are high-energy. Type II is the most common.

Type II or type III? Type II has a split component, a cortical break, as well as the depression; type III is a pure depression with the cortex intact. The distinction changes the surgical approach, because a type II can be opened like a book to reach the depression.

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The three columns (Luo 2010, PMID 20881634). A CT-based classification for surgical planning. It divides the plateau into lateral, medial and posterior columns, and every involved column needs its own approach and plate.

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Moore (fracture-dislocations). Moore's classification is used for fractures associated with knee dislocation.

History. The mechanism is an axial load with a valgus or varus force, the "bumper fracture", and the energy level matters: the height of the fall, the speed of the vehicle. Ask about osteoporosis, diabetes and smoking, about anticoagulation, which affects timing, and about the patient's activity level and occupation.

Examination. Look for swelling, bruising, deformity and wounds; feel for tenderness, crepitus and an effusion; movement is limited by pain and instability. The neurovascular examination is mandatory, and all four compartments of the leg are assessed.

The soft tissues decide the timing. Assess the skin first: is the fracture open (grade it by Gustilo), are there fracture blisters and are they clear or blood-filled, and is the skin under tension, tented, or at risk of impending necrosis?

Then the swelling, with the wrinkle test: can you see skin wrinkles over the anterior tibia? No wrinkles means the leg is too swollen for ORIF. The wrinkle test is mandatory before ORIF; document it in the notes with photographs.

The timing decision. A positive wrinkle test with good skin means proceed to ORIF. A negative test means a spanning external fixator and a wait of 7-21 days for the swelling to resolve. Until the wrinkles return, reduce the swelling with ice, a splint and elevation above heart level, continued until the test is positive.

Associated injuries. Each associated injury has its own incidence, method of assessment and implications.

Differential diagnosis. The acute painful swollen knee after injury:

Radiographs. The first-line study is a standard knee series of AP, lateral and oblique views, with stress views if a ligamentous injury is suspected. The key measurements:

• Tibial plateau angle (joint line)
• Condylar widening
• Depression depth

CT. Mandatory for surgical planning in all displaced fractures, with axial, coronal, sagittal and 3D reconstructions. Plain radiographs miss posterior column involvement in up to 30% of cases, and the scan shows what they cannot:

• Articular depression depth, often underestimated on X-ray: guides the need for grafting
• Posterior column involvement: determines the approach
• Fragment size: determines whether screws will hold
• Comminution: influences spanning versus length-stable fixation
• Coronal plane fracture lines

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What CT changes: the plan more than the label. In a prospective study, three experienced trauma surgeons blindly read radiographs alone, radiographs plus CT, and radiographs plus MRI for each injury (PMID 12368643). Adding CT changed the Schatzker classification in only 6% of cases and raised inter-observer agreement modestly, from a mean kappa of 0.68 to 0.73. Adding MRI changed the classification in 21% and the management plan in 23%, and lifted kappa to 0.85 for classification and 0.86 for the plan.

CT earns its place by defining depression depth, articular comminution and the posterior and posteromedial fragments, and therefore the approach and implant, not by relabelling the Schatzker type. That is exactly why the three-column concept is a CT construct, and why, if asked why CT is mandatory, you argue operative planning rather than reclassification.

Note the limits before quoting these numbers: three observers at a single centre, and MRI is not routine practice for these injuries, its advantage here coming largely from documenting the soft-tissue injury that plain films and CT cannot show. Estimates also vary between series; other work puts the CT-induced change in classification nearer 12% and the change in planned treatment around 26%. Quote the direction of the effect, that CT shifts the plan more than the label, rather than defending one precise percentage.

MRI. Indicated for a suspected meniscal injury (for surgical planning), for evaluating ligamentous injury, and for an occult fracture in a non-displaced injury. It is usually done post-operatively or after the swelling subsides.

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Algorithm

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The decision by pattern. The Schatzker type points to the operation, and the patient and the state of the soft tissues shape how and when it is done.

Circular fixation, the alternative to dual plating. The staged pathway ends in dual plating, but for the high-energy bicondylar fracture with a poor soft-tissue envelope there is an alternative definitive strategy, circular (Ilizarov or hybrid) external fixation, which the COTS randomised trial supports. Its best indications are Schatzker V-VI, especially VI (metaphyseal-diaphyseal dissociation), with compromised soft tissues, open injuries, or where extensive dual-plate dissection would risk the skin.

The concept is limited internal fixation plus a ring frame. The articular surface is reduced and held with percutaneous or limited screws, and the ring or hybrid frame bridges the metaphyseal-diaphyseal zone, achieving stability without the soft-tissue stripping of open plating.

Periarticular tensioned wires and half-pins should stay roughly at least 14mm below the joint line to remain extracapsular; a wire that enters the capsular reflection can seed a septic arthritis.

Against dual plating in COTS, ring fixation gave less blood loss, a shorter hospital stay and fewer and less severe reoperations, with equivalent articular reduction and 2-year WOMAC. The trade-off is pin-site infection, the burden of the frame, knee stiffness and the need for surgeon expertise.

Consent. The specific risks to discuss:

• Superficial infection in 2-5%, deep infection in 1-2%
• Wound complications, higher in Schatzker V-VI
• Peroneal nerve injury (1-2%)
• Stiffness, which is common
• Malunion or nonunion (5-10%)
• Post-traumatic OA
• Hardware removal, which may be needed

Equipment. Have ready:

• Plates: lateral locking plate, medial buttress plate, posterior plates
• Screws: lag, raft and locking screws
• Graft: bone graft substitute or autograft
• Imaging: two image intensifiers ideally, for AP, lateral and Schatzker views
• Reduction tools: femoral distractor, reduction clamps, bone tamp

Filling the void. Elevating a depressed articular fragment leaves a metaphyseal void, and supporting it is what stops the surface re-collapsing. Raft screws placed immediately beneath the subchondral bone provide the mechanical support, and the void filler buttresses them. The goal is a stable subchondral construct, raft screws plus a structural void fill, that holds the elevated joint line until union.

The choice of filler is examinable:

• Autograft (iliac crest) is osteogenic but limited in volume and carries donor-site morbidity; allograft avoids that
• Calcium phosphate cement has high compressive strength and a lower rate of articular subsidence and loss of reduction than the weaker, faster-resorbing calcium sulfate, which makes it the favoured filler under a reduced articular surface

Troubleshooting. The common intraoperative problems and their fixes:

Arthroscopic-assisted reduction (ARIF). ARIF suits the simple low-energy patterns, Schatzker I-III: a clean split and/or central depression without metaphyseal comminution. It is not appropriate for bicondylar V-VI or metaphyseal-comminuted fractures. The depression is elevated through a metaphyseal cortical window with a bone tamp under arthroscopic control, then held with percutaneous raft or lag screws, with or without a small plate. Its advantages:

• Direct articular visualisation of the reduction, more accurate than fluoroscopy for confirming a step-off under 2mm
• The associated intra-articular injuries can be diagnosed and treated: lateral meniscal tears in well over half of displaced lateral fractures, chondral and cruciate injury
• Less soft-tissue stripping and smaller incisions than open exposure

Judging the reduction. Postoperative alignment is measured as the MPTA and PPTA on the AP and lateral films. The reduction is judged by these angles, not by the look of the plate.

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Weight-bearing by pattern. Schatzker I-III fractures may be allowed early protected weight-bearing. Types IV-VI are kept strictly non-weight-bearing for a minimum of 6-8 weeks, and osteoporotic bone needs extended protected weight-bearing.

Red flags. What to watch for after surgery:

• Increasing pain or swelling: infection?
• Loss of range of motion: stiffness, arthrofibrosis
• Hardware prominence: may need removal
• Progressive deformity: loss of fixation

Predictors of a poor outcome. The poor prognostic factors are:

1. High-energy mechanism (Schatzker V-VI)
2. Bicondylar involvement
3. Greater than 10mm initial depression
4. Associated ligament injury
5. Post-traumatic OA precursors (cartilage damage)
6. Smoking, diabetes, obesity
7. Articular step-off greater than 2mm

Global Epidemiology

Tibial plateau fractures account for roughly 1% of all fractures and about 8% of fractures in the elderly, with a bimodal distribution: high-energy injuries (road traffic and fall-from-height) in younger men, and low-energy fragility fractures in older women. The lateral plateau is involved most often (Schatzker I-III predominate in most series), reflecting the physiological valgus axis of the knee. Incidence is rising in ageing high-income populations driven by osteoporotic and sporting injuries, while motor-vehicle trauma dominates in low- and middle-income settings.

Side-by-Side Guidance

Registry & Practice Variation

There is no dedicated international tibial plateau fracture registry; most outcome data derive from trauma databases and population cohorts. Population-level Canadian data show a 10-year total knee arthroplasty rate of 7.3% after operative fixation, a 5.3-fold increase over matched controls (Wasserstein et al., [PMID 24430414]). AOANJRR captures subsequent arthroplasty outcomes following tibial plateau fractures. Practice varies internationally: dual plating dominates in North America and Europe, whereas circular/ring fixation retains strong support where soft-tissue compromise is common or plating expertise is limited. Access also varies - high-income systems can deliver staged spanning external fixation within hours, whereas resource-limited settings may rely more heavily on definitive external fixation.